Patents Assigned to Ecole Polytechnique
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Patent number: 7308965Abstract: A noise-absorbing device includes a substantially flat base and embossed and/or hollow elements each including at least one recess. This base reveals with the embossed and/or hollow elements, a configuration exhibiting a fractality zone of between 1 cm and 50 cm, of fractal dimension greater than 2.5 enabling the localization of the waves over the sound frequency range, in the vicinity of the elements.Type: GrantFiled: March 19, 2003Date of Patent: December 18, 2007Assignees: Ecole Polytechnique, ColasInventors: Bernard Sapoval, Marcel Filoche, Michel Chappat, Didier Peyrard
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Patent number: 7306766Abstract: An improved biochip type device comprising a substrate (10) including an intermediate non-absorbent multilayer mirror (12) covered by a layer (14) of high refractive index material having chromophore elements (16) fixed thereon, the layer (14) further including feature (24) for extracting guided-mode light in order to recover the light emitted by the chromophore elements (16) into the layer (14) in response to light excitation, and direct the light to detection and measurement means.Type: GrantFiled: May 20, 2004Date of Patent: December 11, 2007Assignees: Centre National de la Recherche Scientifique, Ecole Polytechnique, Universite de Versailles Saint-Quentin en YvelinesInventors: Claude Weisbuch, Henri Benisty
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Patent number: 7305105Abstract: The disclosed method and system may be used for creating advanced protection means for secure items (e.g. bank notes, identity documents, certificates, checks, diploma, travel documents, tickets) and valuable products (e.g CD-ROMs, DVD's, prescription drugs, products with affixed labels, watches). Secure items are authenticated by shape level lines. The shape level lines become apparent when superposing a base layer comprising sets of lines and a revealing layer comprising a line grating. One of the two layers is a modified layer which embeds a shape elevation profile generated from an initial, preferably bilevel, motif shape image. By modifying the relative superposition phase of the revealing layer on top of the base layer or vice-versa (e.g. by translation or rotation), shape level lines grow and shrink dynamically. In the case that these shape level lines are present, the secure item is accepted as authentic. Otherwise the item is rejected as suspect.Type: GrantFiled: June 10, 2005Date of Patent: December 4, 2007Assignee: Ecole polytechnique fédérale de Lausanne (EPFL)Inventors: Sylvain Chosson, Roger D. Hersch
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Patent number: 7298480Abstract: A broadband ellipsometer/polarimeter system for analyzing a sample includes an illumination source emitting a polychromatic light beam, a polarization state generator (PSG) including a fixed linear polarizer and a substantially achromatic retarder mounted on a rotating holder, a sample holder, a polarization state analyser (PSA) including a fixed linear polarizer and a substantially achromatic retarder mounted on a rotating holder, a primary detection system measuring the intensities at each wavelength of the light beam transmitted through the PSA, optics to collimate the beam into the PSG and into the PSA and to focus the beam into the sample surface and the detector. The linear polarizer and achromatic retarder in the PSA are identical to those of the PSG but mounted in a reverse order.Type: GrantFiled: December 23, 2005Date of Patent: November 20, 2007Assignee: Ecole PolytechniqueInventors: Enric Garcia-Caurel, Antonello De Martino, Bernard Drevillon
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Patent number: 7295717Abstract: The present invention aims at synthesizing superposition images formed either by band moire shapes or by shape level lines for making the information forwarded by valuable articles or by time pieces such as watches and clocks more dynamic, as well as for improving their attractiveness and aesthetics. A further application is publicity. For synthesizing band moiré images, the present invention relies on a band moiré image layout model allowing to obtain the layout of the base the band grating, given the layouts of the band moire image and of the revealing line grating. Base and revealing layer layouts may be conceived to create band moiré image shapes whose patterns move e.g. radially, circularly, or according to a spiral trajectory. Shape level lines occur in a superposition image when e.g. a base layer comprising modified sets of lines is superposed with a revealing layer comprising a line grating. Such a base layer embeds a shape elevation profile generated from an initial motif shape image (e.g.Type: GrantFiled: October 30, 2006Date of Patent: November 13, 2007Assignee: Ecole polytechnique fédérale de Lausanne (EPFL)Inventors: Roger D. Hersch, Sylvain Chosson, Ran Seri, Pascal Fehr
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Publication number: 20070252580Abstract: A probe for measuring electrical characteristics of an excitation current of a plasma is provided. The probe is mounted on a conductive line that includes an inner conductor and an outer conductor. The probe includes a current sensor and a voltage sensor. The current sensor includes a grove formed in the ground of one of the conductors in order to form a detour for the current flowing through the conductor, and a point for measuring electric voltage between a ground connected to the conductor and a point of the groove. The current sensor thus is able to measure a voltage proportional to the first time derivative of intensity (Iplasma) of the excitation current. The voltage sensor is a shunt sensor capable of measuring a voltage proportional to the first time derivative of the voltage (Vplasma) of the excitation current. A plasma reactor including a probe of the aforementioned type is also provided.Type: ApplicationFiled: September 15, 2005Publication date: November 1, 2007Applicant: Ecole PolytechniqueInventors: Sebastien Dine, Jacques Jolly, Jean Larour
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Patent number: 7276903Abstract: A method for obtaining NMR (=nuclear magnetic resonance) spectra of quadrupolar nuclei having spin I>½ using magic angle spinning (=MAS) in solid powders and transfer of coherences from a neighboring nucleus with spin S= 1/2 to single- or double-quantum transitions of quadrupolar nuclei having spin I>½, is characterized in that the transfer of coherences occurs through a combination of scalar and residual dipolar splittings. With the inventive method improved NMR-spectra can be obtained from which parameters can be extracted, which can be related to the structure and internal dynamics of solids containing the quadrupolar nuclei.Type: GrantFiled: June 8, 2006Date of Patent: October 2, 2007Assignee: Ecole Polytechnique Fédérale de LausanneInventors: Adonis Lupulescu, Sasa Antonijevic, Geoffrey Bodenhausen
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Patent number: 7261144Abstract: A heat transfer assembly for transferring heat from a heat generating device to a circulating fluid, said heat transfer assembly comprising an evaporator device having at least one microchannel formed therein, in thermally conductive contact with said heat generating device, a condenser device, actuating means and manifold means for circulating said fluid between said evaporator device and said condenser device, wherein said heat transfer assembly further comprises a bubble generator capable to create bubbles in said at least one microchannel at a controlled frequency.Type: GrantFiled: September 14, 2004Date of Patent: August 28, 2007Assignee: Ecole Polytechnique Fédérale de Lausanne (EPFL)Inventors: John R. Thome, Vincent Dupont
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Patent number: 7262402Abstract: An integrated imager circuit having a monolithic array of single photon avalanche diodes (SPADs) for capturing an image of a scene when said scene is hit by an optical pulse. The array has a plurality of SPADs connected to 2D readout circuits which determines the intensity of the light reflected by the scene by counting the number of photons received by the SPADs during a period of time. A plurality of SPADs connected to 3D readout circuits determines the distance to the scene by determining the elapsed time between the emission of each pulse and reception of the corresponding reflected photons.Type: GrantFiled: February 14, 2006Date of Patent: August 28, 2007Assignee: Ecole Polytechnique Federal de LausanneInventors: Cristiano Niclass, Edoardo Charbon, Pierre-Andre Besse, Alexis Rochas
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Publication number: 20070193519Abstract: The invention relates to an effusing source for film deposition made of a reservoir comprising one hole characterized by the fact that the hole diameter is less than one order of magnitude than the mean free path of the molecules determined by the pressure and its thickness is at least one order of magnitude smaller than the diameter. Preferably the source has several holes.Type: ApplicationFiled: April 16, 2007Publication date: August 23, 2007Applicant: Ecole Polytechnique Federale De Lausanne (EPFL)Inventors: Giacomo Benvenuti, Estelle Halary-Wagner, Simone Amorosi, Patrik Hoffmann
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Patent number: 7252360Abstract: The present invention proposes a method and a computing system for deducing ink thickness variations from spectral reflectance measurements performed on a printing press or on a printer. The computed ink thickness variations enable controlling the ink deposition and therefore the color accuracy, both in the case of high-speed printing presses and of network printers. Ink thickness variations are expressed as ink thickness variation factors incorporated into a spectral prediction model. The method for computing ink thickness variations comprises both calibration and ink thickness variation computation steps. The calibration steps comprise the calculation of ink transmittances from measured reflectances and the computation of possibly wavelength-dependent ink thicknesses of solid superposed inks. Wavelength-dependent ink thicknesses account for the scattering behavior of non-transparent inks or of inks partly entering into the paper bulk.Type: GrantFiled: October 25, 2005Date of Patent: August 7, 2007Assignee: Ecole polytechnique fédérale de Lausanne (EPFL)Inventors: Roger D. Hersch, Peter Amrhyn, Matthias Riepenhoff
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Patent number: 7252001Abstract: The invention relates to an inertial sensor based on the magnetic levitation of an inertial mass comprising an active magnetic bearing unit arranged in such a way as to levitate the inertial mass and characterized by the fact that it furthermore comprises additional active magnetic bearings units arranged in such a way as to control the position of said inertial mass along three independent axis and to create, for any of said independent axis, restoring forces that can be oriented in any of the two directions of these independent axis.Type: GrantFiled: September 2, 2003Date of Patent: August 7, 2007Assignee: Ecole Polytechnique Federale de Lausanne (EPFL)Inventors: Alexis Boletis, François Barrot, Roland Moser
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Publication number: 20070178460Abstract: The invention concerns a combinatorial method for the generation of new split-protein sensors, and its application towards the (?/?a)8-barrel enzyme N-(5?-phosphoribosyl)-anthranilate isomerase Trp1p from Saccharomyces cerevisiae is demonstrated. The generated split-Trp protein sensors allow for the detection of protein-protein interactions in the cytosol as well as the membrane by enabling trp1 cells to grow on medium lacking tryptophan. This powerful selection thus complements the repertoire of the currently used split-protein sensors and provides a new tool for high-throughput interaction screening.Type: ApplicationFiled: October 8, 2004Publication date: August 2, 2007Applicant: Ecole Polytechnique Federale de LausanneInventors: Petra Tafelmeyer, Kai Johnsson
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Patent number: 7196792Abstract: A liquid crystal based polarimetric system, a process for the calibration of this polarimetric system, and a polarimetric measurement process intended for measuring the representative parameters of a sample in which the polarimetric system contains an excitation section emitting a light beam that passes through a polarization state generator (PSG) and onto a sample. After reflection or transmission by the sample, the beam goes through an analysis section with a polarization state detector (PSD). The PSG and PSD each have a first and a second liquid crystal elements LCj (j=1,2) having, for each LCj element of the PSG (respectively for each LCj element of the PSD), an extraordinary axis making an angle ?j (resp. ??j) with respect to the polarization direction (i), and a retardation ?j (resp (??j) between its ordinary and extraordinary axes, the liquid crystals LCj elements being positioned in reverse order in the PSD with respect to the LCj elements of the PSG.Type: GrantFiled: October 15, 2003Date of Patent: March 27, 2007Assignees: Centre National de la Recherche Scientifique (CNRS), Ecole PolytechniqueInventors: Bernard Drevillon, Antonello De Martino
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Publication number: 20070041611Abstract: The present invention aims at synthesizing superposition images formed either by band moire shapes or by shape level lines for making the information forwarded by valuable articles or by time pieces such as watches and clocks more dynamic, as well as for improving their attractiveness and aesthetics. A further application is publicity. For synthesizing band moiré images, the present invention relies on a band moiré image layout model allowing to obtain the layout of the base the band grating, given the layouts of the band moire image and of the revealing line grating. Base and revealing layer layouts may be conceived to create band moiré image shapes whose patterns move e.g. radially, circularly, or according to a spiral trajectory. Shape level lines occur in a superposition image when e.g. a base layer comprising modified sets of lines is superposed with a revealing layer comprising a line grating. Such a base layer embeds a shape elevation profile generated from an initial motif shape image (e.g.Type: ApplicationFiled: October 30, 2006Publication date: February 22, 2007Applicant: Ecole Polytechnique Federale de Lausanne (EPFL)Inventors: Roger Hersch, Sylvain Chosson, Ran Seri, Pascal Fehr
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Publication number: 20070013373Abstract: A method for obtaining NMR (=nuclear magnetic resonance) spectra of quadrupolar nuclei having spin l>½ using magic angle spinning (=MAS) in solid powders and transfer of coherences from a neighboring nucleus with spin S= 1/2 to single- or double-quantum transitions of quadrupolar nuclei having spin l>½, is characterized in that the transfer of coherences occurs through a combination of scalar and residual dipolar splittings. With the inventive method improved NMR-spectra can be obtained from which parameters can be extracted, which can be related to the structure and internal dynamics of solids containing the quadrupolar nuclei.Type: ApplicationFiled: June 8, 2006Publication date: January 18, 2007Applicant: Ecole Polytechnique Federale de LausanneInventors: Adonis Lupulescu, Sasa Antonijevic, Geoffrey Bodenhausen
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Patent number: 7148209Abstract: The present invention relates to a new method for repairing human or animal tissues such as cartilage, meniscus, ligament, tendon, bone, skin, cornea, periodontal tissues, abscesses, resected tumors, and ulcers. The method comprises the step of introducing into the tissue a temperature-dependent polymer gel composition such that the composition adhere to the tissue and promote support for cell proliferation for repairing the tissue. Other than a polymer, the composition preferably comprises a blood component such as whole blood, processed blood, venous blood, arterial blood, blood from bone, blood from bone-marrow, bone marrow, umbilical cord blood, placenta blood, erythrocytes, leukocytes, monocytes, platelets, fibrinogen, thrombin and platelet rich plasma. The present invention also relates to a new composition to be used with the method of the present invention.Type: GrantFiled: January 7, 2005Date of Patent: December 12, 2006Assignee: Ecole PolytechniqueInventors: Caroline D. Hoemann, Michael D. Buschmann, Marc D. McKee
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Patent number: 7141026Abstract: The present invention relates to a system and a method for monitoring body movement, in particular but not exclusively for evaluating the falling risk and/or for monitoring sitting, standing, lying, walking and running periods. The system is characterized by the fact that it comprises means for determining the time of postural transition.Type: GrantFiled: October 1, 2001Date of Patent: November 28, 2006Assignee: Ecole Polytechnique Federale de Lausanne/ Service des Relations Industrielles (SRI)Inventors: Kamiar Aminian, Bijian Najjafi
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Patent number: 7137952Abstract: A new noninvasive approach for intraocular pressure (IOP) measurement allowing continuous monitoring over prolonged periods, regardless of patient's position and activities. The key element of this measurement method is a soft contact lens (1) including at least one strain gage (2) longitudinally arranged around the center of the contact lens and capable of measuring precisely spherical deformations of the eyeball induced by the changes in IOP. This information is transmitted with wires or (preferably) wirelessly in real time to an external recording system (14). The system is placed in the same way as a normal corrective contact lens, no anesthesia is required and patient vision remains almost completely unimpaired.Type: GrantFiled: June 29, 2001Date of Patent: November 21, 2006Assignee: Ecole Polytechnique Federale de Lausanne-Service des Relations IndustriellesInventors: Matteo Leonardi, Stefan Metz, Daniel Bertrand, Peter Leuenberger
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Patent number: 7132475Abstract: The invention provides methods for the preparation of multiblock copolymers, dispersions of multiblock copolymers, vesicles and micelles containing multiblock copolymers, and oxidative degradation products of multiblock copolymers.Type: GrantFiled: October 19, 2001Date of Patent: November 7, 2006Assignee: Ecole Polytechnique Federale de LausanneInventors: Jeffrey A. Hubbell, Alessandro Napoli, Nicola Tirelli